Knife-blade fuse



A. L. EUSTICE. KNIFE BLADE FUSE. APPLICATION FILED MAR. 7. 191a.

Patented Mar. 2, 1920.

-means for interlocking said 7 of a knife blade fuse, em

' -In the UNITED sTArEs PATENT OFFICE.

ALFRED I. EUSTICE, OF CHICAGO, ILLINOIS.

KNIFE-BLADE FUSE.

Application filed March 7,

To all whom it may concern:

Be it known that I, ALFRED a citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new an useful Improvements in Knife-Blade Fuses, of which the following is a specification.

This invention relates to uses and particularly to the knife blade type of fuse. One of the objects of the invention is to simplify and improve the means for connecting the knife blade and its associated part or parts in a knife blade type of fuse.

Another object is to provide a novel connection between a knife blade, shell and cap of a knife blade fuse whereby the parts may be readily assembled and which permits of self-alinement when the fuse is connected to terminal clips.

These and other ob'ects are accomplished by providing in a fuse the combination of a shell, a knife blade associated therewith, retaining means for the knife blade, and shell, knife L. Eus'rrcn,

blade and retaining means.

The invention, is illustrated on the accompanying sheet of drawings in which, 1

Figure 1 is a fragmenta sectional view ying my invention.

Fig. 2 is an end elevation of the same.

Fig. 3 is a transverse sectional view, taken in the plane of line 3-3 of Fig. 1.

Fig. 4: is a detailed sectional view, showing'the apertured knife blade and the associated retaining means; and,

Fig. 5 is a perspective view of the retaining means.

The various novel tion will be apparent features of my invenfrom the following description and drawin and will be particularly pointed out'in t e appended claims.

knife blade type of fuse, it is particularly desirable to be able to assemble the parts readily and when assembled have the arts so connected and associated with each other to retain the parts in a given relationship, and at the same time permit self-alinement of the fuse when the same is connected between terminals. 1

By referring to the figures of the drawings, it will be noted that I have provided a fuse having a cylindrical shell 10, the ends of which are covered by caps 11' (only one of which is shown), each having an elongated aperture 12, through which a knife Specification of Letters Patent.

.the shell 10, is provi Patented Mar. 2, 1920. 1918. Serial no. 220,865.

blade 13 may extend. The inner end of the knife blade 13, which is located within ded with a central aperture 14:, for the reception of a retaining member 15, preferably of Z shape. The edges of the knife blade 13 are provide with notches or grooves 16 for the reception of the laterally extending embracing portions 17 of the Z-sha ed member 15. The Z-shaped member 15 ms three alined openings, one 18 in the main body portion 19 of the Z-shaped member, and one 20 near the outer end of each of the laterally extending portions 17 of the Z-shaped meme ber 15.

Locking means in the form of a pin 21 passes transversely thkrough diametrically opposite openings 22in the skirt of the cap 11, through corresponding openings in the shell 10 and through the three openings 18 and 20 of the retaining Z shaped member 15, thereby interlockin the shell 10, cap 11, knife blade 13 and shaped retaining member 15. The grooves 16 in the knife blade terminal cooperate with the laterally extending portions 17 of the Z shaped retaining member 15 to prevent a longitudinal movement of the knife blade, and by means of the cooperative action of the various parts in question, the knife blade 13, which passes through the slotted cap 11, while being permitted to move slightly relative to the other parts for self-alinement purposes, is securely held in position. It w1ll be appreciated that the degree of clearance between the pin 21 and inner edges 23 of the knife blade will determine the amount of rotary movement the knife blade may have about its longitudinal axis.

It is evident that there may be modifications of the invention and it is my intention to cover all such modifications, which do not involve a departure from the spirit and scope thereof as set forth in the following claims.

I claim:

1. In a fuse, the combination of a shell, a knife blade associated therewith, Z-shaped retaining means for said knife blade, and means for interlocking said shell, knife blade and retaining means.

2. In a fuse, the combination of a shell, a knife blade associated therewith, Z-shaped means embracing said knife blade, and meansv for interlocking said shell, knife blade and embracing means.

. means for interlocking said shell, cap, knife blade and retaining means.

4. In a fuse, the combination of a shell,

aknife blade extending into said shell and having an aperture, a Z shaped member extending through the aperture of said knife blade, and means operatively connected to said shell, knife blade 5. In a fuse, the combination of a shell, a knife blade extending into said shell and having an aperture and grooved portions,

- a Z shaped member extending through said aperture and having portions lying within said grooved portions to prevent relative movement in one direction between said knife blade and Z shaped member, and means operatively associated with said shell, knife blade and Z shaped member for looking the same together.

6. In a fuse, the combination of a shell, a knife blade extending into said shell and having an aperture and grooved portions,

a Z shaped member extending through the aperture of said knife blade and having portions engaging said grooved portions, and a pin extending through said shell and portions of said 2 shaped member for locking the parts together.

7. In a fuse, the combination of a shell,

and Z shaped mem- .ber forlocking the same together. shell, a knife blade extending a knife blade extending into said shell and having an aperture and grooved portions, a Z shaped member extending through the aperture in said lmife blade and having portions engaging said grooved portions, said 2 shaped member having a plurality of openings, and a locking member extending through said shell, and openings in said 2 shaped member and knife blade for locking the parts together.

8. In a fuse, the combination of a shell, an apertured cap covering the end of said through the aperture in said cap and into the shell, said knife blade having an apertured portion and grooves, an apertured Z shaped member extending through the aperture in the knife blade and having portions occupying the grooves therein, and a locking member extending throu h the cap, shell, and openings in said knife blade and Z shaped member for locking the parts together.

9. In a fuse, the combination of a shell, a knife blade associated therewith, and Z- shaped means connected to the shell within the latter for retaining the knife blade in position.

Signed at Chicago, of February, 1918.

ALFRED L. EUSTICE.

Illinois, this 21st day Witnesses CHAs. L. BYRON,

L. E. HANNEN. 

